The YAsim aircraft seem to have something slightly strange with the prop windmiling when then engine is not running. It's almost as if as you glide, you are winding up a big rubber band or something as the props windmill. Then eventually the props begin to generate so much negative thrust (drag) that you eventually can no longer fly the plane. I've seen this recently in the P51d as well.
Curt. Christopher S Horler writes: > I'm under the impression that an aircraft should be able to glide > sensibly up to the stall and then you may encounter problems depending > on the type of the wing, where the stall will occur on the wing and > whether it will occur on both wings together. > > A prop driven a/c may give additional benefits to the airflow over the > wing. > > Essentially the aircraft should be dynamically stable up to the stall > and offer some degree of predictability in the stall (not necessarily > control). > > Here's my challenge to you... > > Take the dc3 up to 5000' and cut engines whilst cruising. Without > paying any attention to maintaining altitude, make some shallow turns > and try to glide around for a while then try and land the plane once you > get the feel for it. > > I fail to do this. I get an apparent stall, randomly, like one wing is > stalling before the other. I wiggle the rudder a little and wait for the > a/c to come back to me (not sure this has the desired effect). When it > comes back it's alright for a while, then starts again. This might be > argued is the effect of the no power condition. It might be argued my > incidence is to great for the airspeed. I tried the same thing at a > lower incidence and noticed similar results. > > Last time I talked of the dc3 I was saying how it had stability problems > on takeoff, now I have stability problems in the air. Does anyone else > fly this plane? Where does the data come from for this aircraft > configuration? > > The other thing I was wondering about was the way static and dynamic > stability is handled by the fdm. Is it the case that while gear is in > contact with the ground the fdm combines the effect of static and > dynamic stability, adjusting as the tail wheel (or nose) lifts and as > main gear departs removing everything but drag? Is ground effect > modelled? Where can I look at this code - I would like to see how it is > done. (I'll be browsing my CVS while you reply - looking for it) > > Chris > > > > > _______________________________________________ > Flightgear-devel mailing list > [EMAIL PROTECTED] > http://mail.flightgear.org/mailman/listinfo/flightgear-devel -- Curtis Olson IVLab / HumanFIRST Program FlightGear Project Twin Cities curt 'at' me.umn.edu curt 'at' flightgear.org Minnesota http://www.menet.umn.edu/~curt http://www.flightgear.org _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
